Hi friends Today i am going to tell you about some apps which is helpful for calling .its absolutely free.I am giving you the apps.............

1.Viber :-this smartphone apps is the best apps according to me.its sound quality is good as compare to others.you can easily send a massege,video and call to your viber platform .And you can also synchronize your contact.

2.Skype :- This is also a good apps . As we know the desktop version of that apps is too good for video calling .even when we video call through facebook then there comes skype... its not only present in android platform but also present in ios,windows etc platforms.

Link to download this apps:-https://play.google.com/store/apps/details?id=com.skype.raider

3.WeChat :- This apps is also useful for free calling through mobile .it offers not only calling but voice masseging but there are many thing which is very usefull in our day to day life.in this apps you can use waakkie-takkie in which you can add upto 40 contacts.

Link to download this apps:-https://play.google.com/store/apps/details?id=com.tencent.mm